Remove adding test options to the project/build target name hash (#3107)

* Remove adding test options to the project/build target name hash - this should not be put there. The hash in the build target name is used to introduce hashing when buildOptions are changed from the CLI. Otherwise, if options are changed from sources, Bloop recompiles the project anyway because the sources changed. Adding this new hash that comes from sources possibly creates new build targets every time somebody fiddles with some test scope options. It's  just nonsense.

Also look at the comments in the code, we've made a rule and then stopped following it.

* Apply scalafix

* Add test for the number of build targets created when changing options from cli and from sources

* Format

modules/build/src/main/scala/scala/build/Build.scala

@@ -200,22 +200,15 @@ object Build {
     */
   def updateInputs(
     inputs: Inputs,
-    options: BuildOptions,
-    testOptions: Option[BuildOptions] = None
+    options: BuildOptions
   ): Inputs = {
 
     // If some options are manually overridden, append a hash of the options to the project name
     // Using options, not options0 - only the command-line options are taken into account. No hash is
     // appended for options from the sources.
-    val optionsHash     = options.hash
-    val testOptionsHash = testOptions.flatMap(_.hash)
-
-    inputs.copy(
-      baseProjectName =
-        inputs.baseProjectName
-          + optionsHash.map("_" + _).getOrElse("")
-          + testOptionsHash.map("_" + _).getOrElse("")
-    )
+    val optionsHash = options.hash
+
+    inputs.copy(baseProjectName = inputs.baseProjectName + optionsHash.fold("")("_" + _))
   }
 
   private def allInputs(
@@ -278,6 +271,11 @@ object Build {
       overrideOptions: BuildOptions
     ): Either[BuildException, NonCrossBuilds] = either {
 
+      val inputs0 = updateInputs(
+        inputs,
+        overrideOptions.orElse(options) // update hash in inputs with options coming from the CLI or cross-building, not from the sources
+      )
+
       val baseOptions = overrideOptions.orElse(sharedOptions)
 
       val scopedSources = value(crossSources.scopedSources(baseOptions))
@@ -290,12 +288,6 @@ object Build {
         value(scopedSources.sources(Scope.Test, baseOptions, inputs.workspace, logger))
       val testOptions = testSources.buildOptions
 
-      val inputs0 = updateInputs(
-        inputs,
-        mainOptions, // update hash in inputs with options coming from the CLI or cross-building, not from the sources
-        Some(testOptions).filter(_ != mainOptions)
-      )
-
       def doBuildScope(
         options: BuildOptions,
         sources: Sources,

modules/integration/src/test/scala/scala/cli/integration/CompileTestDefinitions.scala

@@ -183,16 +183,7 @@ abstract class CompileTestDefinitions
 
   test("no arg") {
     simpleInputs.fromRoot { root =>
-      val projectFilePrefix = root.baseName + "_"
       os.proc(TestUtil.cli, "compile", extraOptions, ".").call(cwd = root)
-      val projDirs = os.list(root / Constants.workspaceDirName)
-        .filter(_.last.startsWith(projectFilePrefix))
-        .filter(os.isDir(_))
-      expect(projDirs.length == 1)
-      val projDir     = projDirs.head
-      val projDirName = projDir.last
-      val elems       = projDirName.stripPrefix(projectFilePrefix).split("[-_]").toSeq
-      expect(elems.length == 1)
     }
   }
 
@@ -254,18 +245,6 @@ abstract class CompileTestDefinitions
         )
       expect(isDefinedTestPathInClassPath)
       checkIfCompileOutputIsCopied("Tests", tempOutput)
-
-      val projectFilePrefix = root.baseName + "_"
-
-      val projDirs = os.list(root / Constants.workspaceDirName)
-        .filter(_.last.startsWith(projectFilePrefix))
-        .filter(os.isDir(_))
-      expect(projDirs.length == 1)
-      val projDir     = projDirs.head
-      val projDirName = projDir.last
-      val elems       = projDirName.stripPrefix(projectFilePrefix).split("[-_]").toSeq
-      expect(elems.length == 2)
-      expect(elems.toSet.size == 2)
     }
   }
 
@@ -697,4 +676,47 @@ abstract class CompileTestDefinitions
       expect(out.contains("Too small maximum heap"))
     }
   }
+
+  test("new build targets should only be created when CLI options change") {
+    val filename = "Main.scala"
+    val inputs = TestInputs(
+      os.rel / filename ->
+        """object Main extends App {
+          |  println("Hello")
+          |}
+          |""".stripMargin,
+      os.rel / "Test.test.scala" ->
+        """object Test extends App {
+          |  println("Hello")
+          |}
+          |""".stripMargin
+    )
+    inputs.fromRoot { root =>
+      os.proc(TestUtil.cli, "compile", extraOptions :+ "--test", ".").call(cwd = root)
+
+      def buildTargetDirs = os.list(root / Constants.workspaceDirName)
+        .filter(os.isDir)
+        .filter(_.last != ".bloop")
+
+      expect(buildTargetDirs.size == 1)
+
+      os.write.over(
+        root / filename,
+        """//> using dep com.lihaoyi::os-lib:0.9.1
+          |
+          |object Main extends App {
+          |  println("Hello")
+          |}
+          |""".stripMargin
+      )
+
+      os.proc(TestUtil.cli, "compile", extraOptions :+ "--test", ".").call(cwd = root)
+      expect(buildTargetDirs.size == 1)
+
+      os.proc(TestUtil.cli, "compile", extraOptions ++ Seq("--test", "-nowarn"), ".").call(cwd =
+        root
+      )
+      expect(buildTargetDirs.size == 2)
+    }
+  }
 }